连铸大方坯结晶器喂带过程钢带摆动与变形行为的数值模拟

Numerical simulation of swing and deformation behavior of steel strip in bloom continuous casting during steel strip feeding process

连铸结晶器喂钢带是一种可以有效改善铸坯中心偏析和疏松缺陷的技术。研究者们大多致力于研究不同喂带工艺参数的影响,然而喂带过程中钢带在结晶器内的摆动及变形行为也是制约喂带工艺工业化应用的关键所在。以钢带的喂入深度为基础,建立了双向流-固耦合模型,研究了喂带过程中钢带受到钢液冲击而存在的摆动行为,发现喂带速度为0.20 m/s时钢带摆动的最大位移为8.71 mm,并在此基础上建立了单向流-热-固耦合模型,研究了喂带过程中钢带受热存在的变形行为,发现喂带速度是影响钢带变形行为的关键,当喂带速度从0.10 m/s增加到0.20 m/s时,钢带变形的最大位移从12.02 mm增加到了42.03 mm。

Steel strip feeding process is a kind of technology which can effectively eliminate the central segregation and porosity defects of bloom continuous casting.Most researchers mostly focused on studying the effects of different feeding parameters during the feeding process,however,the swing and deformation behavior of the steel strip in the mold is another key factor to the industrial application of the technology.A two-way fluid-solid coupling model was established based on the feeding depth of the steel strip when the feeding process reached a dynamic equilibrium,and the swing behavior of the steel strip under the shock of molten steel was also studied.It is found that the maximum swing displacement of the steel strip is 8.71 mm when the feeding velocity is 0.20 m/s.Based on this,a two-way fluid-solid coupling model was established to study the deformation behavior of the steel strip during the heating of molten steel.It is found that the feeding velocity is the key factor affecting the deformation behavior of the steel strip.When the feeding velocity increases from 0.10 m/s to 0.20 m/s,the maximum displacement of the steel strip deformation increases from 12.02 mm to 42.03 mm.